<!DOCTYPE html>
<html>
	<head>
		<meta charset="UTF-8">
		<title></title>
	<style type="text/css">
		#hd{
			width: 200px;
			height: 150px;
			background: dodgerblue;
			/*指定要监控的属性*/
			transition-property: width;
			/*指定运动时间*/
			transition-duration: 2s;
			/*指定延迟时间*/
			transition-delay: 0.5s;
			/*运动曲线*/
			transition-timing-function: ease-in;
			/*transition: width 3s 0.2s ease-in;*/
			
		}
		#hd:hover{
			width: 900px;
		}
	</style>
	</head>
	<body>
		
		<div id="hd"></div>
		
		
	</body>
</html>
